has_many和belong_to关联出现问题，找不到方法

Question

This is a many(proposaltracking)-to-one(partner) relationship.

I am getting undefined method 'reference' for ProposalTracking:Class error with @company.proposalTracking.reference

When I run @company.proposalTracking it returns me the ProposalTracking object.

Here is my model:

class ProposalTracking < ActiveRecord::Base
  set_table_name "Proposal_Tracking"
  belongs_to :partner
end

class Partner < ActiveRecord::Base
  has_many :proposalTracking
end

What I want to get is the attributes of proposalTracking like

@company = Partner.find(params[:id])
@company.proposalTracking.reference

but this results in the error undefined method 'reference' for ProposalTracking:Class

I have read solutions where it is because since it is a one-to-many relation, the partner may have more than one track proposal so I would have to grab the first one using .first but I tried this and it then says

You have a nil object when you didn't expect it!
The error occurred while evaluating nil.reference

Any help would be much appreciated!

Answer 1

It should be

class Partner < ActiveRecord::Base
  has_many :proposal_trackings
end

and you can access it via @company.proposal_trackings . But that's actually an array of ProposalTracking instances (because of has_many) that you have to iterate over to get each attribute

@company.proposal_trackings.map(&:reference)